Superheater.



N. 744,471. PAT-ENTBD NOV. 17, 1.903. J. R. BROWN.

SUPERHEATBR.

APPLIGATIONHLBD APR. ao, 1903.

no MODEL.

UNITED STATES d 'atented November 1*?, 1903.

JOHN ROWLAND BROWN, OF MANSFIELD, OHIO, ASSIGNOR TO THE AULTMAN du TAYLOR-MACI-IINERY COMPANY, vOF MANSFIELD, OHIO, A CORPORA- r*IION OF OHIO.I

suPERHEATER.

srnclrrcArroN forming part of Letters Patent No. 744,471, dated Nevembef 1r, 1903. i

Application filed April 3Q, 1903. lSerial No. 155,016. (No model.)

To all whom it may concern:

Be it known that LJoHN ROWLAND BROWN,

clear, and exact description, reference being had to the accompanying drawings, forming part of this speciiication, in which- Figure 1 is a side elevation showing a wa-v ter-tube boiler provided with my improved superheater system, and Fig. 2 is a vertical cross-section on the line II II of Fig. 1.

My invention relates to the class of superheaters, and is designed to provide fan improved superheater system wherein a watercirculation may be maintained through the superheater when it is flooded with water. These superheaters have ordinarily been connected to the water-circulation by a single pipe for ooding the superheater; butin such cases there is no substantial circulation in the superheater, such as is important in keep ing the tubes from burning out and giving the tubes long life. The superheater arranged in accordance with my invention becomes when flooded a part of the boiler proper and forms a part of the water-heating surface.

In the drawings, 2 2 represent the steam and water drums, 3 and4 the end headers, and 5 the inclined tubes of a water-tube boiler. I have shown the boiler as provided with bafiies 6 and 7, by which the gases are given three passes in flowing fromthe grate 8 to the outlet. In the intermediate space between the tubes and drums and in the intermediate path of the gases I place the superheater, which preferably consists of longitudinal headers built in the side wall and connected bya series of U -shaped tubes 9, which extend transversely of the boiler-setting. I have shown a duplex system in which the steam entering the upper header or box 10 passes through the upper U-shaped tubes into the intermediate longer box l1. The steam flows from this box through another set of U -shaped tubes into the lower box 12, which is staggered relatively to the upper box. Into the rear side portion of this lower box two tubes are expanded which extend into a fitting 13 at the lower end of an external pipe 14., which is connected into the steam-main, preferably I at a point above the main control-valve, and

may be provided with a valve. The steaminlet pipe 15 is provided with two. branches 16, which extend downwardly into the steamspaces'of the steam and water drums and are provided with dry-pipes 17. The lower end ofthe pipe 15 ispreferably connected to the upper superhe'ater-box'by a fitting and expanded tubes similar to those at the superheateroutlet. The superheater-boxes are preferably set in dead-air spaces in the side wall and are out of the path of the gases. Their inner surfaces may be protected by a covering offire-clay or suitable material.

In order to hood the superheater with water and provide for circulation of water through` it, I connect the frontend of the lower box 12 with the mud-drum 18 by means of a pipe 19, having'a control-valve 20 near the mud-drum, and I connect the upper header or box 10 of the superheater with the forward cross-box 21 of the steam and water drum or to any part of the drum below the water-line by a pipe 22, having a valve 23. In the pipe 19 between the valve 2O and the connection with the superheater-boxlconnecta pipe 24, forming a by-pass containing a control-valve 25. To floodthe superheater, the valves in pipes 19 and 22 are opened, thus permitting a water-circulation from the mud-drum throughr the pipe 19 to the lower superheater-header, thence through the superheater and through pipe 22 to the water space of the steam and water drum, and thence to the mud-drum through the rear Ycirculating-tubes 26. To blow offthe superheater, the valve 2O is closed and the valve 25 is opened. If the valve 23 and the pipe 22 are closed during the blowing off of the superheater, the superheater will be drained; but if the valve, 23 is open the sediment will be removed from `superheater tubes and headers, while the circulation of water is maintained.

The advantages of my invention `result from the connections arranged to cause a circulation of water through the superheater by which it becomes Van integral part of the boiler; also from the blow-off device for cleaning the superheater.

Many variations may be made in the form and arrangement ofthe boiler, the 'super- IOO heater, and the water connections without departing from my invention.

I claiml. In combination with a boiler, a superheater having suitable connections with the steam-space of the boiler, and connections with the water-space of the boiler by which a circulation of water may be maintained through the superheater; substantially as described.

2. In combination With a boiler having upper and lower water-spaces, a superheater connected to the steam-space of the boiler and connected also with said upper and lower water-spaces; substantially as described.

3. In combination with a boiler having upper and lower water-spaces, a superheater connected to the steam-space of the boiler, and valved connections between the superheater and said upper and lower water-spaces; substantially as described.

4. In combination with a boiler having upper and lower water-spaces, a superheater connected to the steam-space of the boiler, valved connections between the superheater and said upper and lower water-spaces, and a blow-on? pipe in the connection between the superheater and the lower water-space; substantially as described.

5. AWater-tube boilerhaving front and rear headers connected by inclined water-tubes, an upper steam and water drum,a superheater arranged in the intermediate path of the gases over the water-tubes, a lower muddrurn, and Water-circulating pipes connecting the superheater with the mud-drum and the water-space of the steam and waterdrum, said pipes having control-Valves; substantially as described.

In testimony whereof I have hereunto set my hand.

JOHN ROWLAND BROWN.

Witnesses:

M. J. COBEAN,

A. I1. BLACK. 

